Skin Reflectance and Oiliness Measurement

4. The method of claim 1, wherein determining the oiliness metric includes determining the oiliness metric in accordance with at least one of a skin color or a skin texture.

5. The method of claim 1 comprising performing one or more correction operations on at least one of the parallel-polarized image or the cross-polarized image of the skin area.

6. The method of claim 1 comprising performing a calibration operation.

7. The method of claim 1, wherein the intensity threshold is determined in accordance with an 80-95th percentile intensity value of the difference image.

8. The method of claim 1, wherein the threshold intensity is set so as to exclude from the at least one portion of the difference image any part of the skin area without surface oil.

9. The method of claim 1 comprising determining the skin surface oil quantity using the oiliness metric.

10. A non-transient computer readable storage medium containing instructions for execution by a processor for carrying out the method of claim 1.

14. The apparatus of claim 11, wherein determining the oiliness metric includes determining the oiliness metric in accordance with at least one of a skin color or a skin texture.

15. The apparatus of claim 11, wherein the processor is configured to execute instructions to perform one or more correction operations on at least one of the parallel-polarized image or the cross-polarized image of the skin area.

16. The apparatus of claim 11, wherein the processor is configured to execute instructions to perform a calibration operation.

17. The apparatus of claim 11, wherein the intensity threshold is determined in accordance with an 80-95th percentile intensity value of the difference image.

18. The apparatus of claim 11, wherein the threshold intensity is set so as to exclude from the at least one portion of the difference image any part of the skin area without surface oil.

19. The apparatus of claim 11, wherein the processor is configured to execute instructions to determine the skin surface oil quantity using the oiliness metric.

20. The apparatus of claim 11, wherein the processor is configured to execute instructions to generate at least one of a treatment evaluation or a treatment suggestion.